X^2-9=4(10)

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Solution for X^2-9=4(10) equation: 


Simplifying
X2 + -9 = 4(10)

Reorder the terms:
-9 + X2 = 4(10)

Multiply 4 * 10
-9 + X2 = 40

Solving
-9 + X2 = 40

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '9' to each side of the equation.
-9 + 9 + X2 = 40 + 9

Combine like terms: -9 + 9 = 0
0 + X2 = 40 + 9
X2 = 40 + 9

Combine like terms: 40 + 9 = 49
X2 = 49

Simplifying
X2 = 49

Take the square root of each side:
X = {-7, 7}

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